Grate-surface of furnaces.



PATENTED APR. 21, 1908.

F.GOLD.

GRATE SURFACE OF FURNACES.

APPLI TI N FILED .26. 1907.

0A 0 MAR 3 SHEETS-SHEET 2.

No. 885,608. PATENTED APR. 21, 1908.

F. GOLD. GRATE SURFACE OF FURNACES.

APPLICATION I'ILBDMAB 26 1907 3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

FRANK GOLD, OF RICHMOND, VICTORIA, AUSTRALIA.

GRATE-SURFACE OF FURNACES.

Application filed March 26, 1907.

To all whom it may concern:

Be it known that I, FRANK GOLD, a subject of the King of Great Britain and Ireland, residing at 95 Palmer street, Richmond, in the county of Bourke, State of Victoria, and Commonwealth of Australia, have invented certain new and useful Improvements in the Grate-Surfaces of Furnaces, of which the following is a specification.

My invention relates to furnaces used for the generation of steam, or other purposes, and its object is to provide a greater supply of air to the fuel.

I am aware that irregular surfaced fire bars, moving fire bars, and other forms of bars have been used. Also that inclined shaking bars, rocking bars in one form or another have been introduced. But with my combination a grate surface is provided, in which air attacks the fuel in six places. In two places (through ordinary fire bars), in two places (from each side of the fire) and in two places (from the middle of the fire). The air entering into the sides and middle of the fire passes through bearers. These bearers are hot and communicate their heat to the said air. Additional heat is imparted to the air by its passage through elevated air suppliers.

Referring to the drawings which form a part of this specification :Figure 1 is a plan supplier.

of my grate surface. In the left hand portion everything is in place and complete. In the right hand portion, half of the intermediate elevated air supplier and the whole of a side elevated air supplier are removed. Portion of the intermediate and the whole of a side bearer is exposed. Fig. 2 is a side elevation of. an end rib, protruding from the side piece (shown in section) of a side elevated air Fig. 3 is a side elevation of one of the middle ribs protruding from the side piece (shown in section) of an elevated air supplier. Fig. 4 is a view of my invention looking at the fire door end of the grate surface as shown in Fig. 1. Fig. 5 is a side elevation of a fire bar. Fig. 6 is a side elevation of one of my sideelevated air suppliers. The left hand ortion shows the area exposed to the fuel, t e right hand portion shows the back of it adjoining the furnace wall. Fig. 7 is a side elevation of my intermediate elevated air su plier. The left hand half is in elevation, t e right hand half in section. Fig. 8 is a side elevation of a side bearer. The left hand portion represents the area adj oin- Specifieation of Letters Patent.

Patented April 21, 1908.

Serial No. 364,569.

ing the wall of the furnace. The right hand portion represents the area meeting the fire bars. The intermediate bearer is similar to the side bearers, save that both its longitudinal members are the same and have spurs protruding from them. Fig. 9 is a sectional elevation of the shell of a boiler showing my invention in position. The left hand half of my invention has been shown full and complete as a side elevation. In the right hand ialf parts have been removed showing a fire bar and the spurs thereon and the area exposed to the fuel of a side elevated air supplier. Fig. 10 is a transverse section through the complete grate.

Similar letters of reference indicate similar or corresponding parts where they occur in the several views My invention includes a furnace of any character. On one end of this is a dead plate Y which adjoins the fire door. Near the other end of the said furnace is abridge Z. Upon the said dead plate and the said bridge, or-upon extensions therefrom, rest my fire bars and bearers. The said furnace and the said dead plate and bridge are of any ordinary character.

Upon (see Fig. 9) the dead plate Y rests the door end A of a fire bar, the longitudinal member of which is marked B. The bridge end C of this rests upon the bridge Z or an extension thereof. From the longitudinal member and at each side of the same protrudes spurs D. The length of these spurs, the width of the same, their height and distance from each other will depend upon circumstances.

Protruding from the door end and the bridge end of each bar (see Fig. 1) is an alining rib E. There is also in each door and bridge end the alining groove F. The number of the fire bars will vary, being dependent upon conditions.

Near each side of the furnace are placed side bearers. Each side bearer has an outer longitudinal member G and an inner longitudinal member I-I. Between these two members are (see Fig. 1) cross pieces J. The spaces between these are marked C The outer or wall furnace member G is preferably shallower than the inner member H. At one end of the said side bearer is a door end Aand at the other a bridge end O. Upon the said door and bridge ends may be alining ribs E or grooves F as described in connection with the fire bars. From the innerlongitudinal member I-Iprotrudes spursD. The number, myself to the exact details of construction conformation and disposition of these agrees and arrangement described since various with the spurs protruding from the fire bars before referred to. Standing above the door end A of each of the side bearers is a shovel guide K. The said shovel guide is preferably integral with the said bearer and is so designed that instead of the front end of the firemans shovel striking the end ribs M (hereinafter described) of the side elevated air suppliers hereinafter referred to and being injured by the impact, it glides upwardly.

Above each side bearer before referred to is situated a side elevated air supplier. Each one of these consists essentially of a side piece L. This adjoins the furnace'wall. Protruding inwardly towards the fuel and integral with or attached to said side piece are ribs. These are of three characters. All of them on the top are of rounded conformation. The said rounded formation extends from the top to the side piece L, to the surface of the bearer. Plain or end ribs are marked M and are flat along their bottom edge. Other ribs N are rovided with lugs marked N By the said ugs N the side elevated air supplier is maintained in its correct relative position upon its bearer. The third class of rib is marked 0 and is hollow on its underneath edge. These are situated near the middle of the air supplier. The number of these ribs, their distance from each other, the thickness of the same and other dimensions will depend upon conditions.

In the middle of the furnace (see Figs. 1 and 4) is situated an intermediate bearer. This has longitudinal members P and cross pieces Q. The spaces between these are marked B The door end B rests upon the dead plate Y or an extension thereof, and the bridge end S rests upon the bridge Z or an extension therefrom. Protruding from the longitudinal members are spurs D. The disposition, proportions and number of these corresponds with the spurs upon the fire bars before described. The ends of the said bearers may be provided with alining ribs E and alining grooves F, of the same character as those described in connection with the fire bars. Resting above the said intermediate bearer is an intermediate elevated air sup- This has side walls T and a crown lier. Through each end wall of the said intermediate elevated air-sup lier may be (see Figs. 2 and 7) an end air ho e V. The area of this hole, if any, will depend upon circumstances. In its sides are side air holes W. Below the said intermediate elevated air supplier protrudes a foot X. This foot fits into the spaces B formed between the longitudinal members P and the cross pieces Q of the intermediate bearer. The area of the side air holes W as also the number of the same will dependu on circumstances.

I do not wis to be understood as limiting slight and immaterial modifications may be made therein without departing from the spirit and the scope of my invention. For instance the shape of the grate surface in plan may not be rectangular as shown, but in some instances may be constructed of a circular, octagonal, or any other suitable conformation which will be particularly applicable to the class of boiler to the furnace of which my invention is to be fitted.

The passage of air through my fire bars, bearers and elevated air suppliers is as follows :-A current enters the ash-pit below the furnace door or enters from any other source and some of it passes up underneath and be tween the fire bars. Some of it, there being no obstruction to its upward passage passes through the spaces B formed between the longitudinal members and the cross pieces of the intermediate bearer. This bearer being hot heats the air. This air then passes through the foot of the intermediate elevated air su plier and passes into the interior of said e evated air supplier. It then passes outwardly through the side air holes W and on to the side of the fuel. Some air also passes through the spaces C between the longitudinal members and the cross members of the side bearers. These side bearers are also hot. It rises upwardly and passes between the ribs M, N, and 0. It is thereby liberated to the sides of the fuel. With my invention air not only ascends between fire bars as in the ordinary manner, but also ascends through bearers and through air su liers above the fire bars and above t e earers.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is 1. In combination with grate bars, a hollow bearer P arranged centrally of the grate between and parallel with the grate bars and having vertical openings; an intermediate hollow air supplier arranged over and mounted upon said bearer and having a crown and vertical slits forming air holes in its walls, and also having depending lugs engaging the openings in said bearer to prevent displacement of the air supplier thereon.

2. In combination, a grate, hollow side bearers at opposite sides of and parallel with the grate, side air suppliers supported upon said side bearers and each comprising a side iece adjacent the wall of the fire chamber aving a series of curved lateral ribs projecting inwardly over the open spaces of the side bearers, said ribs being rounded on their upper surfaces and projecting above the surface of the grate and the central ribs standing above the end ribs.

3. In combination, a grate com osed of ribbed bars hollow side bearers H at each side of the grate having vertical openings, air su pliers supported upon said side bearers an each comprising a side piece L adjacent the wall of the fire chamber formed with a lateral series of inwardly extending ribs N, O, rounded on their upper surfaces and projecting above the surface of the grate and extending over the open spaces of the side beraers, the ribs N having depending lugs adapted to engage recesses in the bearers.

4. In combination, hollow side bearers, an intermediate hollow bearer parallel therewith, said bearers having vertical openings for the passage of air, and parallel fire bars arranged between said intermediate and side bearers; side air suppliers arranged above and supported upon the side bearers each comprising a late provided with an inwardly projecting series of lateral ribs projecting above the side bearers and rising above the surface of the grate, and an intermediate air supplier resting upon the intermediate bearer and projecting above the grate and having vertical slotsforming air holes in its side walls.

5. In combination, side bearers GH, an intermediate bearer P parallel therewith, said bearers having openings for the passage of air, parallel fire bars D arranged between the intermediate and side bearers, removable side air suppliers arranged above, and supported upon the side bearers and each comprising a plate L provided with an inwardly projecting series of ribs N, O, said ribs being curved on their upper sides and projecting above the surfaces of the grate, and an intermediate removable air sup lier W resting upon the intermediate bearer and projectabove the side bearers and having air odes in its walls,

6. Improvements in the grate surfaces of furnaces consisting of the combination of fire bars having longitudinal members, spurs protruding from said longitudinal members, a door end on each fire bar, a bridge end on each fire bar, alining ribs and alining grooves on and in said ends, side bearers having outer and inner longitudinal members, cross pieces, a door end and a bridge end, s urs protruding from the said inner longitu inal member, a shovel guide above said door end of each side bearer, a side elevated air supplier above each side bearer, said side elevated air suplier consisting of a side. iece, plain and holowed ribs, and ribs wit-1 lugs, an intermediate bearer consisting of longitudinal members, cross pieces, a door end and a bridge end, spurs protruding from said longitudinal members, an intermediate elevated air supplier above said intermediate bearer, said intermediate elevated air supplier having side walls, air holes in the side walls, a crown and a foot, all as and for the purposes hereinbefore described or as illustrated in the drawin s.

In testimony whereof I afiiX my signature in the presence oftwo subscribing witnesses.

FRANK GOLD.

Witnesses:

EDWIN PHILLIPS, CECIL W. J. SLASTRIER. 

